Scraping machine



Dec. 13, 1927.

W. F. EVANS SCRAPING MACHINEl Filed Jan. 1o, 1927 D M .LA ,o o

Patented Dec. 13, 1927. l UNITED STATES PATENT OFFICE.

WILLIAM F. EVANS, OF ANDERSON, INDIANA.

SCRAPING MACHINE.

Application led January 10, 1927. Serial No. 160,197.

This invention relates to improvements in Opening in the head portion ofsaid cup. machines for scraping or smoothing and has Journaled in thehead portion of said cu especial reference to machines of this kind is apower shaft which is adapted to be intended for the scraping orsmoothing of actuated 'by a driving shaft from an electric walls orceilings which are incumbered with motor, or from any other suitablesource of mutilated and fragmentary remains of wall power. Secured tot-he frontal portion of the paper or like surface coverings. power shaftis a cutter device consisting of The removal of such material by the useof a spider having an annular rim of diameter hand tools is not onlytedious and time conto loosely occup the bore of the easement l0 sumingbut is generally accompanied by at its mouth andY being provided withcutter disagreeable and injurious odors and dust. blades whic registeron a plane substan- There is also the soiling of the wood-worktiallyco-incidental with the plane of the and oors, and more orlesschipping or mouth of the easement. At the rear of the nieking of thewall surface which even then Said cutter device a fan wheel which is isnot entirely ridden of small fragments secured to the said power shaftis operable of paper. to gather the dust and shavings produced Theobject of this invention is to provide by the knives, and to dischargesame from a portable implement or machine tool by the cup. A handleelement or housing which the above named disadvantages may which issecured to the easement is of form be overcome, and which machine, whilebeto enclose a driving shaft which may coning relatively small in sizeand light in Sist of a iexible shaft from any suitable weight, is highlyefficient, and is capable of Source of power, or from the shaft of anbeing operated by a person of only ordinary electricmotor which may beenclosed in the Skill, handle element or housing adapted to be A form ofembodiment of my invention lu-ld by the operators hand. An annular whichis considered desirable for the general anti-friction bearing betweenthe peripheral purposes for which it is intended, is that portion of thecutter element, and the base shown in the drawings, and described in therim ofthe dust cup, is provided. A rcs-.supe following specification.The invention is clement arranged between the housing eledefined in theseveral claims. The several mentand the dust. cup is operable to varythe parts of my invention are identified by suitposit-ion of the dustcup to cause the cutter able characters of reference applied to themdevice to operate on a plane beyond the in the several views in thedrawings, in plane of the mouth of the Casement. which- The metaleasement A is about 4 inches Figure 1 is a side view of my improved indiameter and has the annular lip A1, and scraping machine, a portion ofthe handle the lmachined 4annular flange A2. Spaced or motor housingbeing broken away, and studs A3 secured in the walls of said casetheeasement being shownin cross-section. ment erform the functions to bepresently Figure 2 is a sectional top plan view taken descri ed. A castframe structure which is on line 2-2 in Figure 1. made of form toloosely occupy the bore of Figure 3 is a sectional top plan View takenthe said easement, and which is designated on line 3 3 in Figure 1. as adust cup consists of a head plate B,

Figure 4 is a view of Figure 1. taken `in wallsC and base ring D. In thehead plate the direction of arrow 4 in Figure 1, a poris provided a,discharge opening E, as shown tion of the easement being broken away. inFigure 2, and which has the upstanding Figure 5 is abottom plan viewFigure 4. li E1. A central boss B formed integral The present form andconstruction of mawith the head plate B, constitutes a bearing chine forcarrying my invention into effect, for the power shaft F which isretained in comprises a cast aluminum easement having said bearing by ashoulder F. Hub G a cylindrical bore `and being provided with whichsupports the fan vanes H and H, is a smooth mouth rim, which is adaptedto secured to the body portion of the said power lie against the surfacewhich is to be scraped. shaft. On the forward end of the power Retainedin this easement against` rotashaft Ais, secured the hub J of a spiderlike tive movement but movable longitudinally,Y structure whose spokesJ1 support annular is a cu shaped frame element which may be rim K.Secured to each of the spaced seats term a dust cup, there being adischarge K1 of said rim K, is a. cutter blade L. Seatthrough theanti-friction bearing element M ed in an annular' seat of the rim K, isa ball race M which constitutes an antifriction bearing between the saidcutter element and the base ring D of the dust cup walls. Spaced slotsCl in the walls of the dust cup loosely engage the studs A3. With thehub J secured to the power shaft the severalparts just described areretained in the assembled form as shown in Figure 1.

In the shouldered end of the power shaft F is a central angular recessF2, into which an angular stem N1 of the driving shaft N is engaged.

To the casement A there is secured a handle element by which the machineas an entirety maybe held and manipulated by the user. The presentmachine being designed to have its driving shaft N actuated by anelectric motor connected at position close to the said Casement, thehandle element is made to serve also as a frame or housing for themotor, and it may be designated as a housing O. The machined annularflange O1 of this housing -is secured by cap screws O2 to the flange A2of the easement.

Formed integral with the said housing is a discharge conduit P whosedownwardly disposed lips PI are of contour and depth to register withand to close the opening between the said conduit and the opening E ofthe head of the dust cup. The discharge portion 'of said conduit P iscomposed of nozzles P2. To these nozzles, suitable hose pipes thatextend to a dust receiving bag or receptacle (not shown) are to beattached. A boss Q of a cross member Q1 of the housing frame, has itsbody portion threaded. On this threaded body portion is disposed apressure sleeve R -whose lower face engages a suitable seat in the headplate B of the dust cup. A handle bar R.l extends from said sleevethrough a suitable opening or slot O3 therefor in the housing. Thethreads of the said boss Q are of such pitch that a movement of the barR1 only a slight distance obtains the desired pressure against the headplate of the dust cup.- For operating xthe machine on ordinary wallsurfaces, the sleeve R is set so that the cutting blades L project veryslightly beyond thc plane of the mouth of the easement.

It is obvious that the operative may obtain a very eifective and equablepressure on the cutting blades L, the thrust therefor being transmittedfrom the base ring D and the peripheral portion of the spider elementwhich carries said blades. While the said blades are, in the presentstructure, set in radial alignment, it is obvious that they may be setat an angle, or at an incline. The shavings or cuttings produced by thesaid blades readily pass between the spokes ".Ifof `thfelgspider framewhence they are drawn away-by the fan device. While a positive andeffective cutting or scraping is obtained, the machine is free fromvibration or dancing and is steady and dependable in operation. Theshavings, dust particles and efliuvia rising in the dust cup are caughtby the fan wheel and blown through the discharge conduits E and P. Fromthe nozA Zles P2 which lead from the discharge open` ing P, suitablepipes may be extended to a bag like receptacle (not shown) which the 5operative may carry on his shoulder. No preparatory treatment of thewall surface is necessary. My improved machine is simply set in motionby attaching an electric conductor tothe plug connection T. The pressuresleevel R having been adjusted so that the cutting blades L are at thecorrect cutting plane, the operative moves the machine along the wallsurface. The material being scraped from the wall being retained againstescapement into the air, the work of scraping the wall is renderedsanitary, and the soiling of wood work and the floors is prevented.

I am aware that my invention may be embodied in mechanisms of-detail andstructure different from that shown in the present drawings andspecification, and within the scope of the invention as defined in theappended claims, without departing from the spirit of the invention.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A scraping machine of the kind described, comprising a easementhaving a 10 mouth to engage the surface of the object to be scraped, acutter element operable at said mouth, a dust receptacle frame in saideasement to receive the scraped contents and having a discharge opening,the said 105 receptacle being held against rotative movement but beingfree to move longitudinally,

a fan element to discharge the contents of said receptacle, a handleelement securedY to the easement, an anti-friction bearing be- 11 tweenthe cutter element and the said dust receptacle, a driving means todrive the cutter element and fan element, and a device to move and holdthe dust receptacle frame at varied projected positions.

2. A machine of the kind described, comprising an open easement havingamout-h to .engage the object to be scraped, a. cutter element operableat the mouth of the casement, a dust receptacle retained in said case-12 ment held against rotative movement but free to move longitudinally,and whose forward end is in anti-frictional bearing engagement with thecutter element and which said dust receptacle has a discharge openingtherein, a. fan element to discharge the contents of said cup, a handleframe element secured tothe easement' and having a discharge conduit tocommunicate with the discharge opening of Said dust receptacle, a 13vided with a mouth to engage the surface of.

the object to be scraped, a cup shaped frame retained in said easementand having a discharge opening therein, a power shaft eX- tendingthrough the head plate of said cup frame, a cutter element secured tothe said shaft and operable at the mouth of said casement, anyanti-friction bearing between the cup frame and the said cutter element,a fan element sec-ured to the said shaft and adapted to discharge thecontents of said cup frame, and a device between the casement andhousing structure and the head plate of the cup frame to vary theposition of the latter longitudinally of the casement.

4. A scraping machine of the kind described,.comprising a Casementhavingcylindrical bore, a cup shaped frame loose in said bore therebeing a discharge opening therein, a power shaft journaled in said cupframe, a cutter wheel actuated .by said shaft and having its knivesoperable at the mouth of said casement, an anti-friction bearing betweenthe peripheral portions of the cup frame and the cutter wheel, a fanwheel operable inside the cup frame to drive the contents therefrom, amotor housing secured to the Casement, and means to varyg the distancebetween the said housing and the said 5. A machine of the kinddescribed, comprising a easement having a cylindrical blow the contentsof the cup through the discharge opening, a motor housing secured to thesaid easement, a driver shaft actuated by the motor and being adapted toflexible engagement with the aforesaid power shaft, an anti-frictionbearing between the peripheral portions of the cup frame and the cutterwheel, and a device operable from outside the easement and housing, tomove and to hold the cup frame at positions adjusted longitudinally ofthe easement.

6. A scraping machine, comprising an open easement having a cylindricalbore, a housing associated lwith said easement, a driver shaft journaledin said housing, a cup shaped frame having its head plate provided witha discharge opening and its base ring being of diameter to register withthe bore of the easement, means to hold the cup frame against rotativemovement and free for movement longitudinally of the easement, a powershaft journaled centrally of said cup frame, and adapted toreceivegexible connection with said driver shaft, a cutter wheel securedto said power shaft and being of diameter to occupy the mouth portion ofthe bore of the Casement, an annular antifriction bearing ring betweenthe peripheral portion of the cutter wheel and the base ring of the cupframe, and a device between the housing and the cup frame to vary theposition of the cutter wheel relative to the plane of the mouth of theCasement.

7. A machine of the kind described, comi prising a easement having openforward end, a housing secured to said easement, a motor in saidhousing, a pressure frame mounted loose longitudinally in said casementand which is held against rotative movement, a power shaft journaled andretained in said pressure frame, power transmitting connections betweenthe said power shaft and said motor, a rotary cutter secured to saidshaft, an anti-friction bearing between the end'of the pressure frameand the said cutter, and an adjuster` sleeve between the pressure frameand the housing, to vary Y the position of pressure frame longitudinallyof the easement.

WILLIAM F. EVANS.

